LINNEAN CLASSES AND ORDERS. 53 



''Anther terminal, persistent: 

 Ex. Helleborine, (Epipactus.) 



'^Anther terminal, deciduous : 

 Ex. Tender Tway-blade, (Malaxis.)* 



2. Diandria : ex. Ladies'-slipper, (Cyprepedium.) 



3. Htwamlria : ex. Birth-wort, (Aristolochia.)t 



TWENTY-FIRST CLASS.— Monoecia. 



Plants androginous, that is, Stamens and 

 Pistils in separate flowers upon the same plant. 

 Orders 9. 



The first seven are distinguished by the 

 number of the stamens, as Monandria, Diandria, 

 Triandria, Tetrandia, Pefitandria, He.vandria, 

 Polyandria. The eighth and ninth by the number 

 of sets into which the stamens are formed, as 

 Monodelphia and Polyadelphia. 



1 . Monandria : ex. Horned Pond-weed, (Zanni- 

 chellia.) 



• All the plants of this and the second order, belong to the natural 

 order OrchidecB. 



t Natural order Aristolochiece. 



